{

DataTable(uint _max_file_num=1000,uint _max_file_data_rows=1000,uint _data_rows=0);

~DataTable();

typedef int64_t KeyType;

std::string get_data_status_info_name() const;

uint get_max_rows() const;

uint get_max_file_num() const;

uint get_max_file_data_rows() const;

uint get_data_rows() const;

uint get_data_file_num() const;

static DataTable* get_instance();

static void instance_mutex_init();

void create_index();

void search(int col=0,int minimum=LONG_MIN,int maximum=LONG_MAX);

void insert(std::vector<KeyType>& keys);

BTree* bt; //B+树索引

static void lock(pthread_mutex_t* mutex);

static void unlock(pthread_mutex_t* mutex);

static const std::string data_path;

const std::string index_path="./IndexFile/";

const uint max_rows=1000000; //最大数据量

const uint max_file_num; //最大文件数

const uint max_file_data_rows; //每个文件最大数据量

const static uint max_recent_file=5;

uint data_rows; //目前的数据行

uint data_file_num;//目前已经存在的文件数目

static DataTable* data_instance; //Table对象实例

std::vector<int> all_file; //存储所有文件,以序号标识

std::vector<pthread_mutex_t> all_file_mutex; //所有文件的的互斥锁

pthread_mutex_t all_file_usage_mutex; //互斥访问

std::vector<int> all_file_usage_status; //所有文件使用状态

std::map<int,std::fstream&> recent_file; //最近的打开文件表

pthread_mutex_t recent_file_mutex[max_recent_file];//对打开文件的锁

//访问打开文件状态的锁

static pthread_mutex_t recent_file_status_mutex;

std::vector<int> recent_file_status;

//整个表的所有文件信息

static const std::string data_status_info_name;;

std::fstream data_status_info;

pthread_mutex_t row_status_info_mutex;

std::vector<int> file_row_info;

//对象锁

static pthread_mutex_t instance_mutex;

static pthread_mutex_t data_rows_mutex;